120 lines
4.4 KiB
Java
120 lines
4.4 KiB
Java
/*
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* Copyright (c) 2002, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @bug 4292867
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* @summary Check that InetAddress doesn't continue to throw UHE
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* after the name service has recovered and the negative ttl
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* on the initial lookup has expired.
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* @run main/othervm/timeout=200 -Djdk.net.hosts.file=CacheTestHosts
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* CacheTest
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*/
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.security.Security;
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import java.io.PrintWriter;
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import java.io.FileWriter;
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import java.io.BufferedWriter;
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public class CacheTest {
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public static void main(String args[]) throws Exception {
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/*
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* First check the ttl on negative lookups is in the <15 second
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* range. If the ttl is <=0 it means we cache forever or always
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* consult the name service. For ttl > 15 the test would take
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* too long so we skip it (need to coordinate jtreg timeout
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* with negative ttl)
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*/
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String ttlProp = "networkaddress.cache.negative.ttl";
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int ttl = 0;
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String policy = Security.getProperty(ttlProp);
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if (policy != null) {
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ttl = Integer.parseInt(policy);
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}
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if (ttl <= 0 || ttl > 15) {
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System.err.println("Security property " + ttlProp + " needs to " +
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" in 1-15 second range to execute this test");
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return;
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}
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String hostsFileName = System.getProperty("jdk.net.hosts.file");
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/*
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* The following outlines how the test works :-
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*
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* 1. Do a lookup via InetAddress.getByName that it guaranteed
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* to succeed. This forces at least one entry into the cache
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* that will not expire.
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*
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* 2. Do a lookup via InetAddress.getByName that is guarnateed
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* to fail. This results in a negative lookup cached for
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* for a short period to time.
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*
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* 3. Wait for the cache entry to expire.
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*
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* 4. Do a lookup (which should consult the name service) and
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* the lookup should succeed.
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*/
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// name service needs to resolve this.
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addMappingToHostsFile("theclub", "129.156.220.219", hostsFileName, false);
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// this lookup will succeed
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InetAddress.getByName("theclub");
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// lookup "luster" - this should throw UHE as name service
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// doesn't know anything about this host.
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try {
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InetAddress.getByName("luster");
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throw new RuntimeException("Test internal error " +
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" - luster is being resolved by name service");
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} catch (UnknownHostException x) {
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}
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// name service now needs to know about luster
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addMappingToHostsFile("luster", "10.5.18.21", hostsFileName, true);
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// wait for the cache entry to expire and lookup should
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// succeed.
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Thread.currentThread().sleep(ttl*1000 + 1000);
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InetAddress.getByName("luster");
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}
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private static void addMappingToHostsFile ( String host,
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String addr,
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String hostsFileName,
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boolean append)
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throws Exception {
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String mapping = addr + " " + host;
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try (PrintWriter hfPWriter = new PrintWriter(new BufferedWriter(
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new FileWriter(hostsFileName, append)))) {
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hfPWriter.println(mapping);
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}
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}
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}
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